<template>
  <div class="list" ref="wrapper">
    <div>
        <div class="area">
            <div class="title border-topbottom">当前城市</div>
            <div class="button-list">
                <div class="button-wrapper">
                    <div class="button">{{this.currentCity}}</div>
                </div>
            </div>
        </div>
        <div class="area">
            <div class="title border-topbottom">热门城市</div>
            <div class="button-list">
                <div class="button-wrapper"
                 v-for="item of hot" 
                :key="item.id" 
                @click="handleCityClick(item.name)">
                    <div class="button">{{item.name}}</div>
                </div>
            </div>
        </div>
        <div class="area" v-for="(value,k) of cities" :key="k" :ref="k">
            <div class="title border-topbottom">{{k}}</div>
            <div class="item-list">
                <div class="item border-bottom" v-for="item of value" :key="item.id" @click="handleCityClick(item.name)">{{item.name}}</div>
            </div>
        </div>
  
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapState,mapMutations} from 'vuex'
export default {
name:'CityList',
props:{
  cities:Object,
  hot:Array,
  letter:String
},
computed:{
   ...mapState({currentCity:'city'})
},
methods: {
  handleCityClick(city){
    this.BIAN(city)
    this.$router.push('/')
  },
  ...mapMutations(['BIAN'])
},
watch:{
  letter(){
       if (this.letter) {
        //  获取对应元素
        const element = this.$refs[this.letter][0]
        //滚动到指定元素上
        this.scroll.scrollToElement(element)
      }
  }
},
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>
